Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a9729ee231bcf6c…

MALICIOUS

PDF

82.3 KB Created: 2021-09-08 11:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2ed1dcfb6a07cea72e8508e389c5a7b6 SHA-1: 3e16c5117d2d06bc03fa3c7a0197ea2af0528987 SHA-256: 8a9729ee231bcf6c338eaf54c4a32034354df265c176a0a078558f6830fe0d35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous URLs, many with UTM parameters, suggests an attempt to lure victims to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://krisoc.ru/uplcv?utm_term=dennis+kelly+love+and+money+pdf PDF link annotation
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/6uiffsegj8nn9vinhhn3d64rqi/dotaxevenubimatufojogaf.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/32963731607.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee4d2251b14---xenigamajipuvefugobasa.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/5ea4d9ee83b3e0394b4d73896d813fde/1868177890.pdfIn PDF document text
    • https://gestionarival.com/userfiles/file/47612406516.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/58897808603.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/e49cfaabb85fdc7933ae469fe0ec690a/64785170108.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f85f9ef2f3---webaxirutofagijigi.pdfIn PDF document text
    • http://rogo-rotterdam.nl/files/62726905991.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/45699486398.pdfIn PDF document text
    • https://2winit.com/Files/files/61747223681.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/53506091305.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/kowoxobitevekogiximo.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/79371309082.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/41232103174.pdfIn PDF document text
    • http://gtlfuelmarine.com/userfiles/file/viraralamusogalalolupunuz.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/83054464878.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/selunekakizafuju.pdfIn PDF document text
    • http://solartgaleria.hu/images/file/kikolutidapavosi.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/63398098127.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/31995155433.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7c8574343b---41290525618.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/kixegubuketeziwibarowi.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD8 17908 bytes
SHA-256: 3b0ed60acd0711eb14199ebee2ba70b3ccd85ac1278e03f11e693ff577375936
font_01_sfnt_off00010ae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE9 10732 bytes
SHA-256: c3eb4a5019aef8f11b2b8ad5a32b0816919c7451a1c4730f31557c0b83ef7f74
font_02_sfnt_off00012393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12393 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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